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(11)

EP 2 697 734 A1

(12)

(43) Date of publication: 19.02.2014 Bulletin 2014/08 (21) Application number: 11863326.2 (22) Date of filing: 15.04.2011

(51) International Patent Classification (IPC):  G06G 7/50(2006.01) (86) International application number: PCT/US2011/032741 (87) International publication number: WO 2012/141720 (18.10.2012 Gazette 2012/42)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (71) Applicant: Landmark Graphics Corporation Houston, TX 77042-3021 (US)	(72) Inventors: MA, Jianfu Houston, TX 77096 (US) WILLIAMS, Kenneth, E. Houston, TX 77042 (US) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)